Harness head motion for looms



Aug. 3 1926.

w. H. HUBBARD HARNESS HEAD MOTION FOR LOOMS Filed July 2, 192a Patented Aug. 3, 1926.

; UNITED, STATES t -PATENT. FIc'L;

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' Application filed July 2,

It is the object of this invention to provide certain improvements in a loom head motion of the general type shown in Reissue Patent- No. 7,784, issued July 3, 1877, this mechanism being well known to the trade as the Knowles head motion.

One feature of my invention consists in providing two separate harness pattern chain cylinders for a Knowles head, by the use of which two sets of harnesses may be independently controlled by separate pattern chains which, however, are'simultaneously advanced.

Another feature of my invention relates to the provision of an improved supporting structure for the depending portions of the two pattern chains by means of which both chains may be kept clear of all other parts of the head motion.

It is also an object of my invention to so construct the pattern cylinders and the chain supporting structure that the two chains may be operated very closely adjacent, so that a maximum number of harness jacks may be operated.

y invention further relates to arrangements and combinations of parts-which will be hereinafter described and more particularly pointed out in the appended claim.

A preferred form of the invention is shown in the drawings in which-- Fig. 1 is a side elevation of certain parts of the well known Knowles head motion;

Fig. 2 is an end elevation looking in the direction of the arrow 2 in Fig. 1; and

Fig. 3 is a sectional side elevation of the intermediate chain support, taken along the line 3--3 in Fig. 2.

Referring to Fig. 1, I have shown a por tion of a frame 10 in which is-mounted an upper cylinder gear 11, a lower cylinder gear 12, vibrator gears 13 and vibrator links or connectors 14 through which harness jacks 15 may be rocked on their pivot 16. The position of the vibrator gears 13 is determined by pattern rolls 17 which engage vibrator levers 18, all in the usual manner and substantially as described in the re -issue patent above noted.

A cylinder shaft20 is mounted in fixed bearings at opposite sides of the head mo- 192s. Serial No. 648,865.

15. A pattern chain 23 is intermittently advanced by the cylinder 22 to determine the movements and positions of one group or series of jacks 15 and a second separate pattern chain 241 is mounted on the pattern cylinder 21 to control the remaining acks 15.

A supporting frame is provided for the depending portions of the pattern chains. said frame comprising side brackets 25 and 26 firmly secured by bolts 27 to the loom frame 10 and also held in spaced relation by cross bars 28 and 29.

An intermediate sup-porting frame member 30 is mounted on the cross bars 28 and 29 and may be adjustably secured in such a position on the cross bars that the frame 30 will support the adjacent ends of the bars in both chains upon which the rolls .17 are mounted. By thus using a single supporting member for the inner ends of both sets of bars, I am able to. reduce the space between the cylinders so that a minimum number of harness jacks 15 need be omitted.

This arrangement of chains and cylinders in a Knowles head motion is found to be of substantial advantage in the weaving of certain kinds of cloth in which some of the warp threads may form a pattern which is very frequently repeated, while the remaining warp threads form a more extended pattern which requires a much longer pattern chain. By thus using two pattern cylinders on the same shaft and intermittently advanced in fixed relation to each other, I am able to use a much shorter and simpler pattern chain for the frequently repeated pat tern, thus materially reduce the expense of setting up the pattern.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed otherwise than as set forth in the claim, but what I claim is A head motion for looms having, in combination, a frame, a cylinder shaft mounted therein, two separate harness pattern chain cylinders each fixed to said shaft, two separate pattern chains for said two cylinders, each chain being formed of a plurality of chain bars linked together and having pattern rolls selectively mounted thereon, and

means to support the depending portions of said chains, said means including fixed side brackets, each having an outwardly and downwardly inclined chain bar engaging laterally adjustable thei eon and effective surface, means to secure said brackets to to support the adjacent ends o f the chain said frame, cross rods connecting said bars in the two pattern chains disposed at 1 brackets at their outer ends and at an ineach side of said supporting element. 5 tei'mediate point in said brackets, and an in- 4 In testiinony whereofl hate hereunto af- V t e rnncdiatecliain barsupporting element fixed my signature; I

supported entirely .by said cross rods and WILLIAM H. HUBBARD. 

